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Volume 96 Number 4 Reviews und abstracts Scanning electron microscopic studies showed three types of surface lesion: (1) multiple areas of cavitation along the enamel surface, although clinically no cavi- tations were visible, (2) partial destruction of surface enamel giving the irregular “overetched” appearance with minimal evidence of cavitation, and (3) prismatic pattern of destruction of surface enamel. The unex- posed, protected enamel beneath the bracket more closely approximated the “normal” enamel surface than $he surfaces directly exposed to acid. The Hyoid Bone Position in Mouth reath : Cross-Sectional Study J. Tu~~kin and E. Kudlick Washington, D.C.: Howard University, College of Dentistry, Orthodonfic Department, 1987 A sample of the records of 66 patients (33 male and 33 female patients) was taken from the Orthodontic Clinic of Howard University College of Dentistrv. The type of breather was determined during the gatient’s initial clinical examination. Acetate tracing paper was placed over lateral and frontal radiographs to measure the mandibular plane angle, diameter of the posterior turbinates, deviation of the nasal septum, protuberance of the adenoid tissue, airway, head posture, and the vertical and horizontal distances between the hyoid bone to epiglottis and genial tubercules. The purpose of this study was to evaluate patients who were mouth breathers and nasal breathers to determine whether there were any significant differences between the two groups when comparing mandibular growth patterns and the position of the hyoid bone to the epiglottis and the genial tubercules of the mandible. The conclusions drawn from this study suggested that impedance of the functional airway was associated with high mandibular plane angles, a decrease in hor- izontal distance between the hyoid bone and epiglottis, and a decrease in horizontal distance between the hyoid bone and genial tubercules. AA0 MEETING CALENDAR 1990-Washington, D.C., May 6 to 9, Washington Convention Center 1991 -Seattle, Wash., May 12 to 15, Seattle Convention Center 1992-St. Louis, MO., May 10 to 13, St. Louis Convention Center 1993-Toronto, Canada, May 16 to 19, Metropolitan Toronto Convention Center 1994-Orlando, Fla., May 1 to 4, Orange County Convention and Civic Center 1995-San Francisco, Calif., May 7 to 10, Moscone Convention Center 1996-New York, N.Y., April 21 to 24, Javits Convention Center

The hyoid bone position in mouth breathers: Cross-sectional study

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Volume 96 Number 4

Reviews und abstracts

Scanning electron microscopic studies showed three types of surface lesion: (1) multiple areas of cavitation along the enamel surface, although clinically no cavi- tations were visible, (2) partial destruction of surface enamel giving the irregular “overetched” appearance with minimal evidence of cavitation, and (3) prismatic pattern of destruction of surface enamel. The unex- posed, protected enamel beneath the bracket more closely approximated the “normal” enamel surface than $he surfaces directly exposed to acid.

The Hyoid Bone Position in Mouth reath : Cross-Sectional Study

J. Tu~~kin and E. Kudlick Washington, D.C.: Howard University, College of Dentistry, Orthodonfic Department, 1987

A sample of the records of 66 patients (33 male and 33 female patients) was taken from the Orthodontic Clinic of Howard University College of Dentistrv. The

type of breather was determined during the gatient’s initial clinical examination. Acetate tracing paper was placed over lateral and frontal radiographs to measure the mandibular plane angle, diameter of the posterior turbinates, deviation of the nasal septum, protuberance of the adenoid tissue, airway, head posture, and the vertical and horizontal distances between the hyoid bone to epiglottis and genial tubercules. The purpose of this study was to evaluate patients who were mouth breathers and nasal breathers to determine whether there were any significant differences between the two groups when comparing mandibular growth patterns and the position of the hyoid bone to the epiglottis and the genial tubercules of the mandible.

The conclusions drawn from this study suggested that impedance of the functional airway was associated with high mandibular plane angles, a decrease in hor- izontal distance between the hyoid bone and epiglottis, and a decrease in horizontal distance between the hyoid bone and genial tubercules.

AA0 MEETING CALENDAR

1990-Washington, D.C., May 6 to 9, Washington Convention Center 1991 -Seattle, Wash., May 12 to 15, Seattle Convention Center 1992-St. Louis, MO., May 10 to 13, St. Louis Convention Center 1993-Toronto, Canada, May 16 to 19, Metropolitan Toronto Convention Center 1994-Orlando, Fla., May 1 to 4, Orange County Convention and Civic Center 1995-San Francisco, Calif., May 7 to 10, Moscone Convention Center 1996-New York, N.Y., April 21 to 24, Javits Convention Center